Allow run-ravenwood-tests.sh to use atest-dev

See the Test: line

Test: ATEST=atest-dev ravenwood/run-ravenwood-tests.sh
Bug: 292141694
Change-Id: I18851d99f175578ffec78873599e842f72568c57
diff --git a/ravenwood/run-ravenwood-tests.sh b/ravenwood/run-ravenwood-tests.sh
index 259aa70..a303626 100755
--- a/ravenwood/run-ravenwood-tests.sh
+++ b/ravenwood/run-ravenwood-tests.sh
@@ -20,5 +20,9 @@
 # "echo" is to remove the newlines
 all_tests="$all_tests $(echo $(${0%/*}/list-ravenwood-tests.sh) )"
 
-echo "Running tests: $all_tests"
-atest $all_tests
+run() {
+    echo "Running: $*"
+    "${@}"
+}
+
+run ${ATEST:-atest} $all_tests